Begonia puerensis sp. nov., a new tuberous species of Begonia sect. Reichenheimia (Begoniaceae) from Yunnan, China is described and illustrated. The morphological similarity between the new species and the similar species B. discreta, B. harmandii and B. qingchengshanensis is compared and discussed and a key to Begonia sect. Reichenheimia in China is provided. The new species is assessed as Endangered (EN) following the IUCN Red List Categories and Criteria.
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